casual in WordNet English dictionary

1. hasty and without attention to detail; not thorough
   "a casual (or cursory) inspection failed to reveal the house's structural flaws"; "a passing glance"; "perfunctory courtesy"
   casual  cursory  passing  perfunctory 
   
2. not showing effort or strain
   "a difficult feat performed with casual mastery"; "careless grace"
   casual  effortless 
   
3. occurring from time to time
   "casual employment"; "a casual correspondence with a former teacher"; "an occasional worker"
   casual  occasional 
   
4. marked by blithe unconcern
   "an ability to interest casual students"; "showed a casual disregard for cold weather"; "an utterly insouciant financial policy"; "an elegantly insouciant manner"; "drove his car with nonchalant abandon"; "was polite in a teasing nonchalant manner"
   casual  insouciant  nonchalant 
   
5. appropriate for ordinary or routine occasions
   "casual clothes"; "everyday clothes"
   casual  everyday  daily 
   
6. occurring or appearing or singled out by chance
   "seek help from casual passers-by"; "a casual meeting"; "a chance occurrence"
   casual  chance 
   
7. natural and unstudied
   "using their Christian names in a casual way"; "lectured in a free-and-easy style"
   free-and-easy  casual 
   
8. characterized by a feeling of irresponsibility
   "a broken back is nothing to be casual about; it is no fooling matter"
   fooling  casual 
   
9. without or seeming to be without plan or method; offhand
   "a casual remark"; "information collected by casual methods and in their spare time"
   casual